My last set of cleanup changes before the CS Fair presentation

This includes Grace's one-touch-call feature, which hasn't been tested (by me, at least) because the iOS simulator doesn't emulate the phone call application.
Also:
 - Fixes for resizing of the map during rotation.
 - Fixes for initial sizing of the POI detail view page, as well as resizing during rotation.
 - This also adds a stand-in version of the Historical Sign icon.

Hopefully everybody who has a device provisioned can get this version built and deployed onto their device before the presentation.  I'll be bringing two devices, but the iPhone4S has almost no battery life, so...